package com.zhan.picturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zhan.picturebackend.exception.BusinessException;
import com.zhan.picturebackend.exception.ErrorCode;
import com.zhan.picturebackend.manager.auth.StpKit;
import com.zhan.picturebackend.mapper.UserMapper;
import com.zhan.picturebackend.model.dto.user.UserQueryRequest;
import com.zhan.picturebackend.model.entity.User;
import com.zhan.picturebackend.model.enums.UserRoleEnum;
import com.zhan.picturebackend.model.vo.LoginUserVO;
import com.zhan.picturebackend.model.vo.UserVO;
import com.zhan.picturebackend.service.UserService;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.List;
import java.util.stream.Collectors;

import static com.zhan.picturebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
 * @author 26056
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-05-13 11:00:16
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    @Override
    public long userLogin(String userAccount, String userPassword, String checkPassword) {
        //1.参数校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        //  1).账号不小于4位
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        //  2).密码和确认密码不小于8位
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        //  3).密码和确认密码一致
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        //2.检查是否重复用户名不重复
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq("userAccount", userAccount);
        long result = this.count(userQueryWrapper);
        if (result > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户名已存在");
        }
        //3.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        //4.新增用户
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if (!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.参数校验
        //  1).不为空
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        //  2).账号不小于4位
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
        }
        //  3).密码不小于8位
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        //2.加密
        String encryptPassword = getEncryptPassword(userPassword);
        //3.查询
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq("userAccount", userAccount);
        userQueryWrapper.eq("userPassword", encryptPassword);
        User user = this.getOne(userQueryWrapper);
        //4.不存在，抛异常
        if (user == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号或密码错误");
        }
        //  存在，记录session，用于鉴定全局管理员和用户权限（自定义鉴权注解）
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        // 4. 记录用户登录态到 Sa-token，便于空间鉴权时使用（Sa-token鉴权）
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE, user);
        //脱敏返回
        return this.getLoginUserVO(user);
    }

    @Override
    public String getEncryptPassword(String password) {
        final String SALT = "dream";
        return DigestUtils.md5DigestAsHex((SALT + password).getBytes());
    }

    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        User currentUser = (User) request.getSession().getAttribute(USER_LOGIN_STATE);
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //如果存在，从数据库重新查询，防止之前保存的用户信息后来修改了
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        //可能之后被删了，导致查不到，也抛异常
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return null;
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        //1.判断是否登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (userObj == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        //2.删除session
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        if (user == null) {
            return false;
        }
        return UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

}




